Question

Assume that when adults with smartphone are randomly selected, 55% use them in meetings or classes. If 6 adults smartphone users are randomly selected, find the probability that at least 2 on them use their smartphones in meetings or classes

Answer #1

Let X be the number of people who use smartphones in meetings or classes

Then X ~ Binomial(6,0.55)

We need to compute

Therefore, we get that

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Assume that when adults with smartphones are randomly selected,
55% use them in meetings or classes. If 7 adult smartphone users
are randomly selected, find the probability that at least 2 of
them use their smartphones in meetings or classes.

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